Mainstream Storyline

Cessair's Heart later places a mole Royal Guard and a Great Scholar at Shyllien Nature Reserve to antagonize the Milletian, falsely claiming that one of the Reserves' documents he deciphered states that Milletians will rule Erinn while becoming monsters that destroy everything in their path. The other scholars immediately jump to various conclusions and then leave to report this.

Cessair's Heart removes her robe before she and her goons head to Vales as an attempt to assassinate Krug to sever their alliance with the Elves and Milletians, but the Milletian arrives in the nick of time, forcing her to order a retreat. Kirine then orders Cessair's Heart to be hunted down.

As Shamala scouts Renes in the form of a Rat, she overhears Cessair's Heart, who seems to be excited for the coming battle, calling it a grand fight, and has not felt that particular sensation in quite a while.

Cessair's Heart attempts to intercept Shamala's escape, but she transforms into a Turtle to cushion the impact and then a Black Panther to make her getaway. Ruairi then orders Cessair's Heart to let her go.

As the Milletian tries to destroy Lia Fail, Cessair's Heart tries to stop them. She manages to drive them off from Lia Fail but mysteriously warps back to Lia Fail, and laughs manically. The Milletian then defeats her, she falls into unconsciousness.

After Lia Fail is destroyed and Tarlach disappears, Cessair's Heart stands before Ruairi, her new leader.

Dian is approached by Cessair's Heart, who asks what will happen after she throws everything away. She replies that nothing will remain, calling Cessair's Heart by her real name, "Cecht", revealing to be the other half of Dian. Cecht informs Dian that the preparations for their plans are complete, along with the presence of an intruder.

Heart then goes to fight the intruders: Merlin and the Milletian. With the Milletian already unconscious due to a Cessair's Red Eye magic, Heart fights Merlin and lures him into a trap where he and the Milletian are barricaded.

Meanwhile, Treasure Hunter learns from the ancient texts within Nemeton that Cessair's Heart is actually a Cessair clone that Dian placed her emotions on. This would allow Dian to make her decisions based on logic and without hesitation.

As Ruairi talks to God Fragment within Tarlach, Cessair's Heart intervenes. After he notes that she lied and used him, she explains that since Dian set her free, she no longer cares about the ritual. She then tells Ruairi that Tarlach did not tell him everything, explaining that him being the key to opening the door to another world did not choose his fate, rather it decided his fate. She also explains that his death does not have to last forever. Heart tells him the only way to save Tarlach is to die in his stead; by destroying the altar the moment the ritual finishes and the door to another world opens, the sacrifice would shift to him. Heart asks him if he really wants to go down that path, but after remembering everything that happened in his life, Ruairi believes that it was the only choice he had.

Ruairi then makes the decision to continue the ritual, calling Cessair's Heart to fight the Milletian, Merlin, and Treasure Hunter. Briefly lamenting over Dian's actions of casting her emotions away onto Cecht, Cessair's Heart reveals that the Cessair were the conductor of Adniel long ago and created the "Moonlight of Death" and summons the Gold Dragon. Because her spirit is still tied to Adniel, she controls him and uses him to attack her enemies, despite the Milletian being the current conductor. Upon her defeat, Heart vanishes along with Adniel.